What do the different icons and tooltips mean?

Why does the database scan do X?

Can the overlay please work on all bag addons?

You can see which addons it works with on the Other Addons page. This is a highly requested feature and we want to support it, but all bag addons work differently. We will need to individually adapt the overlay for each bag addon.

It takes so much memory!

Addon memory does not affect your FPS unless you have a very small amount of RAM in your computer. Also, if you are looking right after logging in, check again in a few minutes after garbage collection has happened, it should have drastically dropped.